In a little while, policeman will accept Penny not thinking for herself (5-3)
I believe the answer is:
spoon-fed
'not thinking for herself' is the definition.
(someone spoon-fed does not think on their own)
'in a little while policeman will accept penny' is the wordplay.
'in a little while' becomes 'soon' (I've seen this before).
'policeman' becomes 'fed' (informal term for a federal agent).
'will accept' indicates putting letters inside.
'penny' becomes 'p'.
'soon'+'fed'='soonfed'
'soonfed' going around 'p' is 'SPOON-FED'.
(Other definitions for spoon-fed that I've seen before include "Artificially fostered" , "Having everything supplied (like a baby)" , "Feather-bedded" , "Cosseted" , "Pampered" .)